You can add titles to individual plots and configure default properties for all plot titles.
To add or edit a title on an individual plot: From the Edit menu, click Plot Properties. When the Plot Properties editor opens, click the Title tab.

To specify the appearance of titles for all of your plots, from the Edit menu, click Default Plot Properties, then select the Title tab of the Default Plot Properties editor.
Whether you are using the Plot Properties editor, the specialized Title Properties editor, or the Default Plot Properties editor, the worksheet for editing plot title properties is the same.
The Edit Title Properties editor is shown above. This editor contains the same fields as the Title tab of the Plot Properties editor and the Default Plot Properties editor.
1.To specify a title for the plot, check Show Plot Title.
2. In the Text field, type the title you want displayed in the plot window.
3. In the Font section of the editor, select the font type from the Font dropdown list. Choose the Style; Bold and/or Italic, Color of the font, and a Size of your text.
4. The Font section also includes the option to set Use Font Scaling. Checking this option and selecting a Min Size and Max Size, will set the minimum and maximum size your font can adjust to when resizing the plot window. If this option is not selected, the font size will remain constant regardless of the window's size.
5. Below the Font section on the editor is the Alignment setting of the title. Alignment can display the tile text Center, Left, or Right.
6. The Border section allows you to add a border around the title. You can specify the Color, line Style and Weight.
7. The Background section lets you add a background Color and/or Pattern behind your plot title. It also allows you to set the Transparency of the background.
8. The Sample box provides a preview of your plot title.
Click Apply to save your changes and continue adjusting the appearance of the title. Click OK to save your changes and close the editor.